Manufacturing method for resin-based closed impeller, and closed impeller manufacturing device used in the same

Abstract

To provide a manufacturing method for a resin-based closed impeller capable of manufacturing a closed impeller simply using integral molding, and a closed impeller manufacturing device used in the manufacturing method.SOLUTION: A manufacturing method for a resin-based closed impeller comprising filling the resin and hardening the resin, using a closed impeller manufacturing device 100 including a central member 110 installed in the center and slide members 120A to 120C that can slide from the center of the closed impeller 10 in a direction corresponding to an outer periphery. The slide members 120A to 120C are configured to cover the outer peripheral side of blades 14A to 14C and correspond to a part of the inner peripheral side from a base end part side of adjacent blades 14B, 14C, 14A, and are slid in a sliding direction corresponding to a tangent L2 direction of an inner wall at the base end part of the adjacent blades 14B, 14C, 14A, which are formed to expand toward the outer periphery of the closed impeller 10.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a manufacturing method for a resin closed impeller and a closed impeller manufacturing apparatus used therein. [Background technology]

[0002] Generally, impellers used in pumps are known. There are various types of impellers according to their applications, functions, characteristics, etc. For example, closed impellers have both sides of the blades covered by a main plate and a side plate (shroud), so they have little water leakage and high liquid delivery performance.

[0003] Patent Document 1 discloses a technique relating to a closed impeller in which good gaps are ensured between adjacent blade portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-239731 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventionally, closed impellers have been manufactured by forming vanes (blades) on one of the disk parts (main plate) and welding or adhering the other disk part (side plate) to it. In the above-mentioned Patent Document 1, although blades are formed on each of the main plate and the side plate, the closed impeller is manufactured by fixing (adhering, welding, fitting, etc.) the two disk parts as in the conventional manufacturing method.

[0006] However, conventional manufacturing methods require molding a plurality of components and then assembling the components (by bonding, welding, fitting, etc.), which requires many steps and results in high manufacturing costs.

[0007] Therefore, an object of the present invention is to provide a manufacturing method for a resin closed impeller that can be simply manufactured using integral molding, and a closed impeller manufacturing apparatus used therein. [Means for solving the problem]

[0008] A manufacturing method for a resin closed impeller according to one embodiment of the present invention is a manufacturing method for a resin closed impeller having a plurality of blades, and includes a manufacturing device including a central member installed at a position corresponding to the center of the closed impeller including a through hole in which a rotating shaft for rotating the closed impeller is installed, and a plurality of slide members configured to correspond to the plurality of blades, respectively, and capable of sliding from the center of the closed impeller in a direction corresponding to the outer periphery, and filling the resin and hardening the resin, and the plurality of slide members cover the outer periphery side of the blade corresponding to the slide member, and are configured to correspond to a part of the inner periphery side from the base end side of the blade adjacent to the tip side of the blade, and are slid in a sliding direction corresponding to the tangent direction of the inner wall at the base end of the adjacent blade, which is formed to expand toward the outer periphery of the closed impeller.

[0009] In the above aspect, the multiple sliding members may be configured from the base end side of an adjacent blade to the intersection of an extension line in the sliding direction from the tip end of the blade corresponding to the sliding member and the adjacent blade.

[0010] In the above aspect, the plurality of sliding members may be configured such that a part of the outer circumferential side of the tip of the blade corresponding to the sliding member forms a flat surface in the sliding direction.

[0011] In the above aspect, the multiple sliding members are configured so that at least a portion of the boundary between the multiple blades and the disk portion forms an R-surface, and at least a portion of the boundary between the outer periphery of the tip of the blade corresponding to the sliding member and the disk portion may be configured to form a plane in the sliding direction.

[0012] In the above aspect, the multiple sliding members may be configured to form a plane in the sliding direction from the base end side to a predetermined position on the inclined portion formed between the disk portion and the opposing disk portion of the blade corresponding to the sliding member.

[0013] In the above aspect, the central member may be configured to form a plane on the inclined portions of the plurality of blades from a predetermined position to the tip end side.

[0014] A closed impeller manufacturing apparatus according to one embodiment of the present invention is a closed impeller manufacturing apparatus used for manufacturing a resin closed impeller having a plurality of blades, and comprises a central member installed at a position corresponding to the center of the closed impeller including a through hole in which a rotating shaft for rotating the closed impeller is installed, and a plurality of slide members configured to correspond to the plurality of blades respectively and slidable from the center of the closed impeller in a direction corresponding to the outer periphery, the plurality of slide members covering the outer periphery side of the blade corresponding to the slide member, configured to correspond to a part of the inner periphery side from the base end side of the blade adjacent to the tip side of the blade, and slid in a slide direction corresponding to the tangent direction of the inner wall at the base end of the adjacent blade, which is formed to expand toward the outer periphery of the closed impeller. Effect of the Invention

[0015] According to the present invention, it is possible to provide a manufacturing method for a resin closed impeller that can be simply manufactured using integral molding, and a closed impeller manufacturing apparatus used therein. [Brief description of the drawings]

[0016] [Figure 1A] FIG. 1 is a perspective view showing the appearance of a closed impeller 10 made of resin and having three blades. [Figure 1B]FIG. 1 is a perspective view of a closed impeller 10 made of resin and having three blades, with side plates 12 omitted. [Diagram 2] FIG. 1 is a schematic diagram showing a closed impeller manufacturing apparatus 100 used to manufacture a closed impeller 10 made of resin and having three blades. [Diagram 3] FIG. 1 is an enlarged view showing a state in which one slide member 120A of the closed impeller manufacturing apparatus 100 used for manufacturing the closed impeller 10 made of resin and having three blades is slid. [Figure 4] 11 is a diagram for explaining blades 14A and 14B of the closed impeller 10 formed by sliding a slide member 120A in the slide direction. FIG. [Diagram 5] 13 is a diagram for explaining an inclined portion of a blade 14B formed by sliding a slide member 120B in the slide direction. FIG. [Figure 6] 13 is a diagram for explaining an inclined portion of a blade 14C formed by a central member 110. FIG. [Figure 7] 1 is a perspective view of a closed impeller 10 manufactured by a manufacturing method for a closed impeller according to an embodiment of the present invention, with side plates omitted. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the embodiment described below is merely a specific example for carrying out the present invention, and is not intended to limit the interpretation of the present invention. In addition, in order to facilitate understanding of the description, the same reference numerals are used as far as possible for the same components in each drawing, and duplicated descriptions may be omitted.

[0018] <One embodiment> [Closed impeller overview] Fig. 1A is a perspective view showing the appearance of a resin-made closed impeller 10 having three blades. As shown in Fig. 1A, the closed impeller 10 includes a main plate (disk portion) 11, a side plate (disk portion) 12 facing the main plate, and three blades 14A to 14C. The main plate 11 is formed with a through hole 13 in which a rotating shaft for rotating the closed impeller 10 is installed.

[0019] 1B is a perspective view of a resin-made closed impeller 10 having three blades, omitting the side plate 12. As shown in FIG. 1B, the three blades 14A to 14C each have a tip end that is gradually closer to the through hole 13 from a base end on the outer periphery side of the closed impeller 10.

[0020] In general, a closed impeller is manufactured by, for example, integrally forming a main plate and blades, and then welding or adhering a side plate thereto, but in the present invention, a main plate 11, a side plate 12, and three blades 14A to 14C are integrally formed. The manufacturing method and the manufacturing apparatus used therefor will be described below.

[0021] In FIG. 1B, the side plates 12 are omitted in order to explain the shapes of the three blades 14A to 14C. However, in reality, the closed impeller 10 has the side plates 12, and the same applies to the following explanation.

[0022] [Outline of closed impeller manufacturing equipment] Fig. 2 is a schematic diagram showing a closed impeller manufacturing apparatus 100 used to manufacture a resin-made closed impeller 10 having three blades. As shown in Fig. 2, the closed impeller manufacturing apparatus 100 includes a central member 110 and three slide members 120A to 120C. The closed impeller manufacturing apparatus 100 is a so-called injection molding die.

[0023] The central member 110 is installed at a position corresponding to the center of the closed impeller 10 including the through hole 13 in which a rotation shaft for rotating the closed impeller 10 is installed. For example, the central member 110 is installed so as to be fixed, and configured as a substantially triangular prism so as to correspond to the three blades 14A to 14C of the closed impeller 10.

[0024] The central member 110 has a shape and size that allows it to pass through the inner diameter (suction mouth diameter) of the side plate 12. In the closed impeller 10 given as an example in this embodiment, the inner diameter of the side plate 12 is smaller than the outer periphery of the tips of the three blades 14A to 14C, and the three blades 14A to 14C are formed by the central member 110 and the three slide members 120A to 120C, as described below.

[0025] The three slide members 120A-120C are configured to correspond to the three blades 14A-14C of the closed impeller 10, respectively, and are configured to be slidable in a direction corresponding to the outer periphery from the center of the closed impeller 10. For example, with the three slide members 120A-120C arranged on the central member 110 side, resin is filled between the three slide members 120A-120C and the central member 110, the resin is cured, and then the three slide members 120A-120C are slid in a direction away from the central member 110. In this way, the closed impeller 10 made of resin is integrally formed.

[0026] Incidentally, a series of steps relating to the manufacturing method of the resin-made closed impeller 10, which involves filling with resin, hardening the resin, and sliding the three slide members 120A to 120C, may be entirely or partially controlled by a computer.

[0027] The three slide members 120A to 120C are configured to cover the outer periphery of the corresponding blades 14A to 14C, respectively, and to correspond to a part of the inner periphery from the base end side of the blades 14B, 14C, 14A adjacent to the tip end side of the corresponding blades 14A to 14C. The configurations and sliding directions of the three slide members 120A to 120C will be described in detail below.

[0028] [Structure and direction of slide members] Fig. 3 is an enlarged view showing a state where one slide member 120A of the closed impeller manufacturing apparatus 100 used for manufacturing the resin-made closed impeller 10 having three blades is slid. As shown in Fig. 3, the slide member 120A is configured to cover the outer periphery side of the blade 14A of the closed impeller 10 and correspond to a position X from the base end side of the blade 14B on the inner periphery side. Here, the position X is the intersection point between the extension line L1 from the tip end of the blade 14A in the sliding direction and the blade 14B.

[0029] The blade 14B is formed so as to expand toward the outer periphery of the closed impeller 10, and the sliding direction of the slide member 120A is a direction along a tangent L2 of the inner wall at the base end of the blade 14B.

[0030] By sliding the slide member 120A configured in this manner in the sliding direction, the blade 14B is less likely to be thinned from the base end side to position X on the inner circumference side (there is no need to consider undercut), and the thinning (undercut) on the tip end side of the blade 14A is reduced, thereby making it possible to form a closed impeller 10.

[0031] Fig. 4 is a diagram for explaining the blades 14A and 14B of the closed impeller 10 formed by sliding the slide member 120A in the sliding direction. As shown in Fig. 4, the base end 21 of the blade 14B can be formed in a desired shape without having to consider undercuts because the slide member 120A is slid in the tangential direction of the inner wall at the base end 21 of the blade 14B.

[0032] Furthermore, tip 22 of blade 14A is configured such that a part of its outer periphery forms a flat surface in the sliding direction in order to slide slide member 120A in the sliding direction from position X (shown in FIG. 3). That is, it is necessary to take into consideration some undercut caused by the sliding of slide member 120A, and although there are restrictions on the shape of part of the outer periphery of tip 22 of blade 14A, it is possible to reduce the loss of material.

[0033] In addition, in consideration of strength and durability, it is preferable that the boundaries between the three blades 14A to 14C and the main plate 11 form rounded surfaces. Among the boundaries between the blade 14A and the main plate 11, the outer peripheral region 23 at the tip of the blade 14A is configured to form a flat surface in the sliding direction in order to slide the slide member 120A in the sliding direction from position X (shown in FIG. 3). That is, it is necessary to take into consideration some undercuts due to the sliding of the slide member 120A, and among the boundaries between the blade 14A and the main plate 11, the outer peripheral region 23 at the tip of the blade 14A is restricted from forming a rounded surface, but the majority of the other boundaries can form a rounded surface.

[0034] In addition, in Figures 3 and 4, the configuration and sliding direction of the slide member 120A and the relationship between the blades 14A and 14B of the closed impeller 10 have been explained, but it goes without saying that the same relationship applies to the slide member 120B and the blades 14B and 14C, and the slide member 120C and the blades 14C and 14A.

[0035] [About the inclined part of the blade] Next, the inclined portions of the blades 14A to 14C will be described in detail. Fig. 5 is a diagram for explaining the inclined portion of blade 14B formed by sliding slide member 120B in the sliding direction. As shown in Fig. 5, slide member 120B is configured to cover the outer periphery of blade 14B and correspond to a position X on the inner periphery from the base end side of blade 14C (the intersection of an extension line L1 in the sliding direction from the tip end of blade 14B and blade 14C).

[0036] As shown in Fig. 1A, the blades 14A to 14C are formed so as to be sandwiched between the main plate 11 and the side plate 12 of the closed impeller 10. Fig. 5 shows how the upper surface of the side plate side of the inclined portion of the blade 14B that is inclined from the side plate (omitted in Fig. 5) side toward the main plate 11 side is formed.

[0037] The upper surface of the region of the inclined portion of blade 14B from the side plate side (the base end side of blade 14B) to a predetermined position is covered by slide member 120B, and slide member 120B slides in the sliding direction. As a result, region 24 of the inclined portion of blade 14B from the base end side to the predetermined position is configured to form a flat surface in the sliding direction.

[0038] In this embodiment, the base end side of blade 14B has been described as an example since it is easy to explain using Fig. 5 among the inclined portions of blades 14A to 14C, but the same applies to the base end sides of blades 14A and 14C. Regions 24 from the base end side to a predetermined position in the inclined portions of blades 14A and 14C are configured to form a flat surface in the sliding direction of slide members 120A and 120C, respectively.

[0039] Next, the inclined portions of the blades 14A to 14C on the main plate 11 side (the tip end side of the blades 14A to 14C) will be described.

[0040] Fig. 6 is a diagram for explaining the inclined portion of blade 14C formed by central member 110. As shown in Fig. 6, central member 110 is configured to cover the inner circumferential side and upper surface of the inclined portion of blade 14C on the tip end side.

[0041] As described with reference to FIG. 5, the upper surface (region 24) of the inclined portion of blade 14C on the base end side is formed by slide member 120C, while the upper surface (region 25) on the tip end side is formed by central member 110.

[0042] Since central member 110 does not slide like sliding members 120A-120C, but is pulled out in the vertical direction (the central space of side plate 12 shown in FIG. 1), the upper surface (region 25) of the inclined portion of blade 14C on the tip side does not need to be considered as an undercut, and may be molded into any desired shape.

[0043] For example, central member 110 may be configured so that the upper surface (region 25) on the tip side of the inclined portion of blade 14C is molded to have a rounded surface, or may be configured so that it is molded to be flat.

[0044] If central member 110 is configured so that the upper surface (region 25) of the inclined portion of blade 14C toward the tip end is molded flat, the configuration of central member 110 can be simplified, for example, the end portion can be prevented from having a pointed shape, and the strength and durability of central member 110 can be improved.

[0045] Here, the tip side of blade 14C has been described as an example because it is easy to explain using Fig. 6 among the inclined portions of blades 14A to 14C, but the same applies to the tip sides of blades 14A and 14B. Central member 110 may be configured so that the upper surfaces of the tip sides of the inclined portions of blades 14A and 14B are formed to have an R surface, or may be configured so that they are formed to be flat. Furthermore, if central member 110 is configured so that the upper surfaces of the tip sides of the inclined portions of blades 14A and 14B are formed to be flat, the configuration of central member 110 is simplified.

[0046] [summary] Fig. 7 is a perspective view of the closed impeller 10 manufactured by the manufacturing method for a closed impeller according to one embodiment of the present invention, with the side plates omitted. As shown in Fig. 7, the closed impeller 10 manufactured by the manufacturing method for a closed impeller according to one embodiment of the present invention has the following features.

[0047] The base ends 21 of the blades 14A to 14C can be formed in a desired shape without having to take into consideration undercuts caused by the sliding of the slide members 120A to 120C.

[0048] At the tips 22 of the blades 14A to 14C, undercuts caused by the sliding of the slide members 120A to 120C must be taken into consideration, and a part of the shape of the outer periphery is formed as a flat surface, but the reduction in thickness can be reduced.

[0049] Of the boundaries between the blades 14A-14C and the main plate 11, the outer peripheral regions 23 at the tips of the blades 14A-14C must take into account undercuts caused by the sliding of the slide members 120A-120C, and this restricts the formation of R surfaces; however, it is possible to form R surfaces at most other boundaries.

[0050] Of the upper surfaces of the inclined portions of the blades 14A to 14C, a region 24 from the base end side to a predetermined position is configured to form a flat surface taking into consideration that an undercut will occur in the sliding direction of the slide members 120A to 120C, and a region 25 from the predetermined position to the tip end side is configured to form a flat surface taking into consideration that if the mating surface of the central member 110 with the slide members 120A to 120C is R-shaped, there will be problems with strength and durability.

[0051] As described above, according to the manufacturing method of a resin closed impeller according to one embodiment of the present invention and the closed impeller manufacturing apparatus 100 used therein, the resin closed impeller 10 can be simply manufactured by integral molding. In addition, the resin closed impeller 10 manufactured by the manufacturing method of a resin closed impeller according to one embodiment of the present invention has appropriate strength and durability because the main plate 11, the side plate 12, and the three blades 14A to 14C are integrally molded. In particular, the closed impeller 10 according to the present invention has improved strength and durability in the side plate 12 portion compared to a conventional closed impeller manufactured by welding the side plate to the blades formed on the main plate. In addition, although the blades 14A to 14C of the closed impeller 10 according to the present invention are thinned in consideration of undercuts, the thinning is reduced as much as possible, so that the strength and durability are suppressed from deteriorating compared to a closed impeller manufactured by welding or bonding, and the performance is equivalent.

[0052] In addition, since the process of combining multiple components as required in conventional manufacturing methods is no longer necessary, manufacturing can be done efficiently and at low cost, and defects caused by combining components (such as poor adhesion or welding, misalignment, and individual variations) can also be avoided.

[0053] In this embodiment, a closed impeller 10 having three blades 14A to 14C has been described as an example, but this is not limited to this. For example, the present invention can be applied to a closed impeller having four or more blades as long as the shape of the central member and the sliding members are configured to correspond to each blade.

[0054] The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The elements of the embodiments, as well as their arrangements, materials, conditions, shapes, sizes, etc., are not limited to those shown as examples and can be changed as appropriate. In addition, configurations shown in different embodiments can be partially substituted or combined with each other. [Explanation of symbols]

[0055] 10... closed impeller, 11... main plate (disk portion), 12... side plate (disk portion), 13... through hole, 14A to 14C... blades, 21... base end portion, 22... tip portion, 23 to 25... flat area, 100... closed impeller manufacturing apparatus, 110... central member, 120A to 120C... slide member, L1... extension line, L2... tangent line, X... position

Claims

1. A method for manufacturing a closed impeller made of resin and having a plurality of blades, comprising the steps of: A central member is installed at a position corresponding to a central portion of the closed impeller including a through hole in which a rotary shaft for rotating the closed impeller is installed; a plurality of slide members configured to respectively correspond to the plurality of blades and slidable in a direction corresponding to an outer periphery from the center of the closed impeller; and filling the resin and hardening the resin using a manufacturing device including the plurality of slide members; The plurality of slide members include The sliding member is configured to cover an outer circumferential side of the blade corresponding to the sliding member and to correspond to a part of an inner circumferential side from a base end side of the blade adjacent to a tip end side of the blade, The blades are slid in a sliding direction corresponding to a tangential direction of an inner wall at a base end of the adjacent blade, the tangential direction being formed so as to expand toward the outer periphery of the closed impeller. A manufacturing method for a closed impeller made of resin.

2. The plurality of slide members include The blade is configured from a base end side of the adjacent blade to an intersection point of an extension line in the sliding direction from a tip end of the blade corresponding to the sliding member and the adjacent blade. A method for manufacturing the resin closed impeller according to claim 1.

3. The plurality of slide members include A part of the outer circumferential side of the tip of the blade corresponding to the sliding member is configured to form a flat surface in the sliding direction. A method for manufacturing the resin closed impeller according to claim 1.

4. The plurality of slide members include At least a part of the boundary between the plurality of blades and the disk portion is configured to form an R surface, At least a part of the boundary between the outer circumferential side of the tip of the blade corresponding to the sliding member and the disk portion is configured to form a flat surface in the sliding direction. A method for manufacturing the resin closed impeller according to claim 1.

5. The plurality of slide members include A slope formed between a disk portion and an opposing disk portion of the blade corresponding to the slide member is configured to form a flat surface in the sliding direction from a base end side to a predetermined position. A method for manufacturing the resin closed impeller according to claim 1.

6. The central member is configured to form a plane from the predetermined position to the tip end side of the inclined portions of the plurality of blades. A method for manufacturing the resin closed impeller according to claim 5.

7. A closed impeller manufacturing apparatus used to manufacture a resin-made closed impeller having a plurality of blades, A central member is installed at a position corresponding to a central portion of the closed impeller including a through hole in which a rotary shaft for rotating the closed impeller is installed; A plurality of slide members configured to correspond to the plurality of blades, respectively, and slidable in a direction corresponding to an outer periphery from the center of the closed impeller, The plurality of slide members include The sliding member is configured to cover an outer circumferential side of the blade corresponding to the sliding member and to correspond to a part of an inner circumferential side from a base end side of the blade adjacent to a tip end side of the blade, The blades are slid in a sliding direction corresponding to a tangential direction of an inner wall at a base end of the adjacent blade, the tangential direction being formed so as to expand toward the outer periphery of the closed impeller. Closed impeller manufacturing equipment.

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